regular expresion validator

Question

hi

 

I use Regular Exp as follw for Date dd/mm/yyyy format,but it take the invalid date as 29/02/2015,

31/02/2016 or 31/04/2015 like that..please give me correct expression for valid date

 

<asp:RegularExpressionValidator ID="RegCardIssueDate" runat="server"
ErrorMessage="Please Enter date in dd/mm/yyyy format." ForeColor="Red" ControlToValidate="txtCardIssueDate"
ValidationGroup="Validategroup"
ValidationExpression="(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[012])/\d{4}"></asp:RegularExpressionValidator>